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KVM: vmx, pmu: accept 0 for host-initiated write to MSR_IA32_DS_AREA

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Whenever an MSR is part of KVM_GET_MSR_INDEX_LIST, as is the case
for MSR_IA32_DS_AREA, it has to be always settable with KVM_SET_MSR.
Accept a zero value for these MSRs to obey the contract.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-06-01 03:21:19 -04:00
parent 98defd2e17
commit bfb088d9fb
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/vmx/pmu_intel.c
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@ -443,6 +443,8 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
}
break;
case MSR_IA32_DS_AREA:
if (msr_info->host_initiated && data && !guest_cpuid_has(vcpu, X86_FEATURE_DS))
return 1;
if (is_noncanonical_address(data, vcpu))
return 1;
pmu->ds_area = data;